Real Estate Investments (Intangible Assets and Acquired Lease Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	$ 137,512	$ 137,594
Accumulated Amortization	38,580	35,262
Finite lived intangible assets, net	98,932	102,332
Below market lease	77,054	77,177
Below market lease, accumulated amortization	22,959	21,110
Below market lease, net	54,095	56,067
Intangible liabilities	95,022	95,145
Intangible liabilities, accumulated amortization	24,023	22,062
Intangible liabilities, net	70,999	73,083
Leases, Acquired-in-Place
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	113,310	113,392
Accumulated Amortization	33,998	31,120
Finite lived intangible assets, net	79,312	82,272
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	3,804	3,804
Accumulated Amortization	509	429
Finite lived intangible assets, net	3,295	3,375
Above Market Leases
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets	20,398	20,398
Accumulated Amortization	4,073	3,713
Finite lived intangible assets, net	16,325	16,685
Above-market ground lease liability
Finite-Lived Intangible Assets [Line Items]
Intangible liabilities	17,968	17,968
Intangible liabilities, accumulated amortization	1,064	952
Intangible liabilities, net	$ 16,904	$ 17,016